Lexus ES: Pressure Control Solenoid "C" Actuator Stuck Off (P07957F)
DESCRIPTION
Based on signals from the transmission revolution sensors (NT and NC), the actual gear is detected.
The ECM compares the actual gear with the shift schedule in the ECM memory to detect mechanical malfunctions of the solenoid valves, transmission valve body assembly and automatic transaxle assembly (clutch, brake, gear, etc.).
Actual gear when solenoid (SL3) valve malfunction occurs (without fail-safe control):| ECM commanded gear | 1st | 2nd | 3rd | 4th | 5th | 6th | 7th | 8th |
|---|---|---|---|---|---|---|---|---|
| *: Neutral | ||||||||
| Actual gear during SL3 stuck ON malfunction | 3rd | 3rd | 3rd | 3rd | 3rd to 5th | 7th | 7th | 7th |
| Actual gear during SL3 stuck OFF malfunction | 1st | 2nd | N* | 4th | 5th | 6th | N* | 8th |
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory | Note |
|---|---|---|---|---|---|---|
| P07957F | Pressure Control Solenoid "C" Actuator Stuck Off | All of the following conditions are met (2-trip detection logic):
|
| Comes on | DTC stored | SAE Code: P0796 |
| Vehicle Condition | |||||
|---|---|---|---|---|---|
| Pattern 1 | Pattern 2 | Pattern 3 | Pattern 4 | ||
| Diagnostic Condition | Engine coolant temperature is 40°C (104°F) or higher. | ○ | ○ | ○ | ○ |
| ATF temperature is -10°C (14°F) or higher. | ○ | ○ | ○ | ○ | |
| The vehicle is being driven with the shift lever in D. | ○ | ○ | ○ | ○ | |
| No malfunctions are detected in the solenoid (SL1, SL2, SL3, SL4, SL5, SL6, SL, SLU and SLT) valves, transmission revolution sensors (NT and NC), coolant temperature sensor, oil temperature sensor, knock sensor, crankshaft position sensor circuits, electronic throttle or CAN communication system. | ○ | ○ | ○ | ○ | |
| Malfunction Condition | When the ECM commands the transaxle to shift to 1st gear, the actual gear changes to 3rd gear. | ○ | - | - | - |
| When the ECM commands the transaxle to shift to 2nd gear, the actual gear changes to 3rd gear. | - | ○ | - | - | |
| When the ECM commands the transaxle to shift to 4th gear, the actual gear changes to 3rd gear. | - | - | ○ | - | |
| When the ECM commands the transaxle to shift to 5th gear, the actual gear changes to 3rd to 5th gear. | - | - | - | ○ | |
| Duration | 0.8 seconds or more | 0.8 seconds or more | 0.8 seconds or more | 0.8 seconds or more | |
| Detection Logic | 2-trip detection logic | 2-trip detection logic | 2-trip detection logic | 2-trip detection logic | |
| Vehicle Condition | |||||
|---|---|---|---|---|---|
| Pattern 5 | Pattern 6 | Pattern 7 | Pattern 8 | ||
| Diagnostic Condition | Engine coolant temperature is 40°C (104°F) or higher. | ○ | ○ | ○ | ○ |
| ATF temperature is -10°C (14°F) or higher. | ○ | ○ | ○ | ○ | |
| The vehicle is being driven with the shift lever in D. | ○ | ○ | ○ | ○ | |
| No malfunctions are detected in the solenoid (SL1, SL2, SL3, SL4, SL5, SL6, SL, SLU and SLT) valves, transmission revolution sensors (NT and NC), coolant temperature sensor, oil temperature sensor, knock sensor, crankshaft position sensor circuits, electronic throttle or CAN communication system. | ○ | ○ | ○ | ○ | |
| Malfunction Condition | When the ECM commands the transaxle to shift to 6th gear, the actual gear changes to 7th gear. | ○ | - | - | - |
| When the ECM commands the transaxle to shift to 8th gear, the actual gear changes to 7th gear. | - | ○ | - | - | |
| When the ECM commands the transaxle to shift to 3rd gear, the engine overruns (neutral status). | - | - | ○ | - | |
| When the ECM commands the transaxle to shift to 7th gear, the engine overruns (neutral status). | - | - | - | ○ | |
| Duration | 0.8 seconds or more | 0.8 seconds or more | 0.5 seconds or more | 0.5 seconds or more | |
| Detection Logic | 2-trip detection logic | 2-trip detection logic | 2-trip detection logic | 2-trip detection logic | |
HINT:
This DTC is stored when any of the above detection patterns is met.
MONITOR DESCRIPTION
The ECM commands gear shifts by turning the solenoid valves on and off. According to the input shaft revolution (speed) and output shaft revolution (speed), the ECM detects the actual gear (1st, 2nd, 3rd, 4th, 5th, 6th, 7th or 8th gear). When the gear commanded by the ECM and the actual gear are not the same, the ECM illuminates the MIL and stores a DTC.
MONITOR STRATEGY
| Related DTCs | P0796: Solenoid (SL3) valve/OFF malfunction Solenoid (SL3) valve/ON malfunction |
| Required sensors/components | Solenoid (SL3) valve |
| Frequency of operation | Continuous |
| Duration | OFF malfunction (A) and (B): 0.5 sec. OFF malfunction (C): - ON malfunction (A), (B), (C), (D) and (E): 0.8 sec. ON malfunction (F): - |
| MIL operation | 2 driving cycles |
| Sequence of operation | None |
TYPICAL ENABLING CONDITIONS
All| The monitor will run whenever the following DTCs are not stored | P0717, P07BF, P07C0 (Turbine speed sensor circuit) P0793, P07C5, P07C6 (Intermediate shaft speed sensor circuit) P0962, P0963 (Solenoid (SL1) valve circuit) P0966, P0967 (Solenoid (SL2) valve circuit) P0970, P0971 (Solenoid (SL3) valve circuit) P2814, P2815 (Solenoid (SL4) valve circuit) P281D, P281E (Solenoid (SL5) valve circuit) P08C1, P08C2 (Solenoid (SL6) valve circuit) P2769, P2770 (Solenoid (SL) valve circuit) P2763, P2764 (Solenoid (SLU) valve circuit) P2720, P2721 (Solenoid (SLT) valve circuit) P0117, P0118 (ECT sensor circuit) P0335, P0337, P0338 (Crankshaft position sensor circuit) P0712, P0713 (ATF temperature sensor circuit (TFT sensor)) P0327, P0328, P0332, P0333 (KCS sensor circuit) P0121, P0122, P0123, P0222, P0223, P0604, P0606, P060A, P060B, P060D, P060E, P061E, P0657, P0658, P2102, P2103, P2111, P2112, P2119, P2135 ((ETCS) Electronic throttle control system) U0100 (CAN communication system) |
| Shift position | "D", "not R" and "not N" |
| Elapsed time since shift lever moved from "N" to "D" | 4 sec. or more |
| ATF temperature | -10°C (14°F) or more |
| Engine | Starting |
| Fail-safe function does not operate due to the following malfunctions: | - |
| Solenoid (SL1) valve | OFF or ON malfunction (P0746) |
| Solenoid (SL2) valve | OFF or ON malfunction (P0776) |
| Solenoid (SL3) valve | OFF or ON malfunction (P0796) |
| Solenoid (SL4) valve | OFF or ON malfunction (P2808) |
| Solenoid (SL5) valve | OFF or ON malfunction (P2817) |
| Solenoid (SL6) valve | OFF or ON malfunction (P08BB) |
| Solenoid (SLT) valve | OFF malfunction (P2714) |
| Solenoid (SLU) valve | ON malfunction (P2757) |
| Solenoid (SL) valve | ON malfunction (P0741) |
| All shift solenoids | Not being stopped |
| Neutral command flag | Not met |
| ECM selected gear | 7th |
| Neutral state detected when 3rd gear commanded | - |
| Vehicle stop check | Fixed |
| ECM selected gear | 3rd |
| Neutral state detected when 7th gear commanded | - |
| Vehicle stop check | Fixed |
| ECM selected gear | 1st |
| Vehicle speed | 2 km/h (1.2 mph) or more and less than 38 km/h (23.6 mph) |
| Throttle valve opening angle | 7% or more at engine speed 2000 rpm (conditions vary with engine speed) |
| Calculated load value | - |
| - When A/C off | 16% or more |
| - When A/C on | 19% or more |
| ECT | 40°C (104°F) or more |
| Spark advance from MAX. retard timing by KCS control | 0 °CA or more |
| Calculated input torque | 0 N*m (0 kgf*cm, 0 ft.*lbf) or more |
| ECM selected gear | 2nd |
| Vehicle speed | 2 km/h (1.2 mph) or more |
| Throttle valve opening angle | 7% or more at engine speed 2000 rpm (conditions vary with engine speed) |
| Calculated load value | - |
| - When A/C off | 16% or more |
| - When A/C on | 19% or more |
| ECT | 40°C (104°F) or more |
| Spark advance from MAX. retard timing by KCS control | 0 °CA or more |
| Calculated input torque | 0 N*m (0 kgf*cm, 0 ft.*lbf) or more |
| ECM selected gear | 4th |
| Vehicle speed | 2 km/h (1.2 mph) or more |
| Throttle valve opening angle | 7% or more at engine speed 2000 rpm (conditions vary with engine speed) |
| Calculated load value | - |
| - When A/C off | 16% or more |
| - When A/C on | 19% or more |
| ECT | 40°C (104°F) or more |
| Spark advance from MAX. retard timing by KCS control | 0 °CA or more |
| Calculated input torque | 0 N*m (0 kgf*cm, 0 ft.*lbf) or more |
| ECM selected gear | 6th |
| Vehicle speed | 2 km/h (1.2 mph) or more |
| Throttle valve opening angle | 7% or more at engine speed 2000 rpm (conditions vary with engine speed) |
| Calculated load value | - |
| - When A/C off | 16% or more |
| - When A/C on | 19% or more |
| ECT | 40°C (104°F) or more |
| Spark advance from MAX. retard timing by KCS control | 0 °CA or more |
| Calculated input torque | 0 N*m (0 kgf*cm, 0 ft.*lbf) or more |
| ECM selected gear | 8th |
| Vehicle speed | 2 km/h (1.2 mph) or more |
| Throttle valve opening angle | 7% or more at engine speed 2000 rpm (conditions vary with engine speed) |
| Calculated load value | - |
| - When A/C off | 16% or more |
| - When A/C on | 19% or more |
| ECT | 40°C (104°F) or more |
| Spark advance from MAX. retard timing by KCS control | 0 °CA or more |
| Calculated input torque | 0 N*m (0 kgf*cm, 0 ft.*lbf) or more |
| Turbine speed - output speed x (ECM selected gear ratio) | 1000 rpm or more |
| Neutral state flag | ON |
-
Any of the following conditions are met: Condition (a) or (b)
- Condition (a)
Condition (b)ECM selected gear
3rd
Output speed x 5th gear ratio
Less than 6500 rpm
ECM selected gear
7th
Turbine speed - output speed x 3rd gear ratio
More than 50 rpm
Output speed x 5th gear ratio
Less than 6500 rpm
- Condition (a)
| Vehicle speed | Less than 0 km/h (0 mph) |
| Engine speed | 7200 rpm or more |
| Turbine speed | 7200 rpm or more |
-
Any of the following conditions are met: Condition (a) or (b)
-
Condition (a)
ECM selected gear
6th or 7th or 8th
Output speed x 5th gear ratio
7200 rpm or more
Condition (b)
ECM selected gear
4th or 5th
Output speed x 3rd gear ratio
7200 rpm or more
-
Condition (a)
TYPICAL MALFUNCTION THRESHOLDS
-
Any of the following conditions are met: OFF malfunction (A), (B) or (C) OFF malfunction (A) and (B)
OFF malfunction (C)Neutral state flag
ON
Solenoid (SLT) valve
ON malfunction
-
Any of the following conditions are met: Condition (a) or (b) Condition (a)
Condition (b)ECM selected gear
3rd
3rd gear pass detection
Not fixed after transition to latest gear
ECM selected gear
7th
7th gear pass detection
Not fixed after transition to latest gear
-
Any of the following conditions are met: Condition (a) or (b) Condition (a)
-
Any of the following conditions are met: ON malfunction (A), (B), (C), (D), (E) or (F) ON malfunction (A), (B) and (C)
ON malfunction (D) and (E)Any of the following conditions are met
(a) or (b)
(a) Turbine speed/Output speed (NT/NO)
1.817 or more and 2.082 or less
(When output speed less than 380 rpm)
(b) Turbine speed - Output speed x 3rd gear ratio
-50 rpm or more and 50 rpm or less
(When output speed 380 rpm or more)
ON malfunction (F)Any of the following conditions are met
(a) or (b)
(a) Turbine speed/Output speed (NT/NO)
0.744 or more and 0.876 or less
(When output speed less than 780 rpm)
(b) Turbine speed - Output speed x 7th gear ratio
-50 rpm or more and 50 rpm or less
(When output speed 780 rpm or more)
Solenoid (SLT) valve
ON malfunction
-
Any of the following conditions are met: Condition (a), (b) or (c) Condition (a)
Condition (b)ECM selected gear
4th
4th gear pass detection
Not fixed after transition to latest gear
Condition (c)ECM selected gear
5th
5th gear pass detection
Not fixed after transition to latest gear
ECM selected gear
8th
8th gear pass detection
Not fixed after transition to latest gear
-
Any of the following conditions are met: Condition (a), (b) or (c) Condition (a)
| Turbine speed - Output speed x (ECM selected gear ratio) | 1000 rpm or more |
CONFIRMATION DRIVING PATTERN
CAUTION:
When performing the confirmation driving pattern, obey all speed limits and traffic laws.
HINT:
- After repairs have been completed, clear the DTCs and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
-
When clearing the permanent DTCs, refer to the Clear Permanent DTC procedure.
Click here
.gif)
- Connect the Techstream to the DLC3.
- Turn the engine switch on (IG) and turn the Techstream on.
- Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
- Turn the engine switch off and wait for 2 minutes or more.
- Turn the engine switch on (IG) and turn the Techstream on.
- Start the engine.
-
Perform the D Position Shift Test inspection in Road Test. [*1]
Click here
HINT:
[*1] : Normal judgment procedure.
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
- Stop the vehicle.
- Enter the following menus: Powertrain / Transmission / Utility / All Readiness.
- Input the DTC: P07957F.
-
Check the DTC judgment result.
Techstream Display
Description
NORMAL
- DTC judgment completed
- System normal
ABNORMAL
- DTC judgment completed
- System abnormal
INCOMPLETE
- DTC judgment not completed
- Perform driving pattern after confirming DTC enabling conditions
N/A
- Unable to perform DTC judgment
- Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
HINT:
- If the judgment result shows NORMAL, the system is normal.
- If the judgment result shows ABNORMAL, the system has a malfunction.
- If the judgment result shows INCOMPLETE or N/A, perform the normal judgment procedure again.
CAUTION / NOTICE / HINT
NOTICE:
-
Perform the universal trip to clear permanent DTCs.
Click here
-
Perform registration and/or initialization when parts related to the automatic transaxle are replaced.
Click here
PROCEDURE
| 1. | CHECK DTC OUTPUT (IN ADDITION TO DTC P07957F) |
(a) Connect the Techstream to the DLC3.
(b) Turn the engine switch on (IG).
(c) Turn the Techstream on.
(d) Enter the following menus: Powertrain / Transmission / Trouble Codes.
Powertrain > Transmission > Trouble Codes(e) Read the DTCs using the Techstream.
| Result | Proceed to |
|---|---|
| DTC P07957F and DTC P07457F, P07407E, P07757F, P08BA7F, P27137F, P28077F and/or P28167F are output | A |
| Only DTC P07957F is output | B |
| DTCs other than P07457F, P07407E, P07757F, P07957F, P08BA7F, P27137F, P28077F and P28167F are also output | C |
HINT:
- If any DTCs other than P07457F, P07407E, P07757F, P07957F, P08BA7F, P27137F, P28077F and P28167F are output, perform troubleshooting for those DTCs first.
- If a solenoid valve is stuck ON or OFF, DTCs for several solenoid valves including the malfunctioning solenoid valve will be stored.
| B | .gif) | GO TO STEP 3 |
| C | | GO TO DTC CHART |
|
.gif)
| 2. | CLEAR DTC AND PERFORM STALL SPEED TEST |
(a) Clear the DTCs.
Powertrain > Transmission > Clear DTCsHINT:
Write down the currently output DTCs before clearing them.
(b) Perform the stall speed test.
Click here
| Test Condition | Proceed to |
|---|---|
| Stall speed test can be performed | A |
| Stall speed test cannot be performed | B |
| B | | GO TO STEP 5 |
|
| 3. | INSPECT SOLENOID (SL1), (SL2), (SL3), (SL4), (SL5) AND (SL6) VALVE |
| (a) Remove the solenoid (SL1), (SL2), (SL3), (SL4), (SL5) and (SL6) valves. Click here |
|
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(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| Solenoid (SL1) valve connector terminal 1 - terminal 2 | 20°C (68°F) | 5.0 to 5.6 Ω |
| Solenoid (SL2) valve connector terminal 1 - terminal 2 | 20°C (68°F) | 5.0 to 5.6 Ω |
| Solenoid (SL3) valve connector terminal 1 - terminal 2 | 20°C (68°F) | 5.0 to 5.6 Ω |
| Solenoid (SL4) valve connector terminal 1 - terminal 2 | 20°C (68°F) | 5.0 to 5.6 Ω |
| Solenoid (SL5) valve connector terminal 1 - terminal 2 | 20°C (68°F) | 5.0 to 5.6 Ω |
| Solenoid (SL6) valve connector terminal 1 - terminal 2 | 20°C (68°F) | 5.0 to 5.6 Ω |
(c) Connect a positive (+) lead from the battery with a 21 W bulb to terminal 1 and a negative (-) lead to terminal 2 of the solenoid valve connector. Check that the valve moves and makes an operating sound.
OK:
Valve moves and makes an operating sound.
| NG | | REPLACE SOLENOID (SL1), (SL2), (SL3), (SL4), (SL5) OR (SL6) VALVE |
|
| 4. | INSPECT SOLENOID (SL) VALVE |
| (a) Remove the solenoid (SL) valve. Click here |
|
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(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| Solenoid (SL) valve connector terminal - Solenoid (SL) valve body | 20°C (68°F) | 11 to 15 Ω |
(c) Connect a positive (+) lead from the battery to the terminal of the solenoid valve connector, and a negative (-) lead to the solenoid body. Check that the valve moves and makes an operating sound.
OK:
Valve moves and makes an operating sound.
| NG | | REPLACE SOLENOID (SL) VALVE |
|
| 5. | INSPECT SOLENOID (SLT) VALVE |
| (a) Remove the solenoid (SLT) valve. Click here |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
| Tester Connection | Condition | Specified Condition |
|---|---|---|
| Solenoid (SLT) valve connector terminal 1 - terminal 2 | 20°C (68°F) | 5.0 to 5.6 Ω |
(c) Connect a positive (+) lead from the battery with a 21 W bulb to terminal 1 and a negative (-) lead to terminal 2 of the solenoid valve connector. Check that the valve moves and makes an operating sound.
OK:
Valve moves and makes an operating sound.
| NG | | REPLACE SOLENOID (SLT) VALVE |
|
| 6. | INSPECT TRANSMISSION VALVE BODY ASSEMBLY |
(a) Inspect the transmission valve body assembly.
Click here
OK:
There is no foreign matter on each valve and they operate smoothly.
| NG | | REPAIR OR REPLACE TRANSMISSION VALVE BODY ASSEMBLY |
|
| 7. | INSPECT TORQUE CONVERTER ASSEMBLY |
(a) Inspect the torque converter assembly.
Click here
OK:
The torque converter assembly is normal.
| NG | | REPAIR OR REPLACE TORQUE CONVERTER ASSEMBLY |
|
| 8. | REPAIR OR REPLACE AUTOMATIC TRANSAXLE ASSEMBLY |
(a) Repair or replace the automatic transaxle assembly.
Click here
| NEXT | | PERFORM REGISTRATION |
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